Administrator's Guide

Glossary
3PAR Remote Copy A product that allows you to copy virtual volumes from one HP 3PAR storage system to another.
CLI Command-line interface. An interface comprised of various commands which are used to control
operating system responses.
cluster A group of controller nodes connected via the same storage server backplane. The nodes in a
cluster operate as a unified system, separate from any other clusters that may share the same
service processor.
CLX Cluster Extension.
data distribution Pushing copies of data to geographic locations to make it more easily accessible to many
customers.
data migration Moving data to a new location or to one with a larger capacity.
fabric A network of Fibre Channel switches or hubs and other devices.
failover A role-reversal process where the backup Remote Copy volume group is converted to the primary
Remote Copy volume group.
GUID Globally Unique IDentifier.
heartbeat A periodic synchronization signal issued by cluster software or hardware to indicate that a node
is an active member of the cluster.
high availability Redundant systems, software, and information technology processes to reduce the risk of downtime.
No single point of failure.
LU Logical Unit
MNS Majority node set quorum. A quorum-capable resource introduced by Microsoft. A single quorum
resource that allows you to build clusters with nodes that are geographically separated.
MSFC Microsoft Failover Cluster.
primary volume
group
A Remote Copy volume group that reside on the local or primary HP 3PAR storage system.
quorum In MSFC, a cluster resource that has been configured to maintain essential cluster data and
recovery information. If a node fails, the quorum acts as a tie-breaker and is transferred to a
surviving node to ensure that data remains consistent within the cluster.
Remote Copy links The method by which information is sent and received between Remote Copy targets.
secondary volume
group
A Remote Copy volume group that reside on the remote or backup HP 3PAR storage system.
split-brain
syndrome
A state of data corruption can occur if a cluster is reformed as subclusters of nodes at each site,
and each subcluster assumes authority, starting the same set of applications and modifying the
same data.
target The description of a Remote Copy system on one HP 3PAR storage system in the Remote Copy
pair.
virtual volume A virtual storage unit created by mapping data from one or more logical disks.
VM Virtual Machine.
volume group A group of virtual volumes that are logically related and for which there is a cross-volume ordering
of writes.
World Wide Name
(WWN)
A 64- or 128-bit identifier that uniquely identifies the address of a component on the fabric.
80 Glossary